@article{MZM_2006_80_4_a7,
     author = {A. V. Kolesnikov},
     title = {Integrability of optimal mappings},
     journal = {Matemati\v{c}eskie zametki},
     pages = {546--560},
     publisher = {mathdoc},
     volume = {80},
     number = {4},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2006_80_4_a7/}
}